Pressure gauge



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J. D. PETERSE N June 1 1926.

PRESSURE GAUGE Filed Feb. v1, 192s Patented June l, i926.. iiiE.

JOHN D. FETERSEN, OF DETROIT, MICHIGAN.

PRESSURE GAUGE.

Application iied February l, 1926. Serial No. 85,324.

it is the primary object ot my invention member 29 encloses the rod 2:2 and is proto provide a pressure gauge of cheap and vided intermediate its ends with a cut out economical construction adapted for many section or slothaving a straight side 32 uses but particularly `for gauging the air nearest the piston l() and an angular side 5 ypassed into an inflatable tire such as is used 533 nearest the head 2l. The end 24 ot the on automobiles and adapted to shut ott the plunger Q is diagonally eut to tit on the air passage to such tire when a predeterside of thel slot in the tubular member 29. mined pressure has been attained. i pin 3d entends tl'irough the casing 7 into lffith the above and other objects in view, a slot in the tubular member 29 to per- 65 my invention consists in the arrangement7 mit ot longitudinal movement ot the tubular combination and construction of the various member but prevent rotation thereof. parts of my improved device as described iii A screw threaded opening 36 is provided the specification, claimed in my claims and in the casing 7 to which a hose or other suitf shown in the accompanying drawing7 in able conductor ot air or iiuid leadingfrom 70 le which :H- a source ot supply may be attached and a Fig. l is a central sectional view showingI passavo 37 is provided leading from the my improved device. opening 36 to the chamber 38 within the cas- Fig. 2 is a detailed end view ot one end ing 'i'. YWhen air or other material is passed of the saine, showing the connection leading from a source of supply through the open- 75 2@ therefrom by which a tire may be inflated. ing 36 and passage 37 into the chamber 38, Fig. 3 is a detailed view ot' the plunger it will pass around the head 2l through the 1utilized in my device. passage between the rod 22 and the in-y I have. shown a casing 5 having a reduced side of the casing 7 and thence through the screw threaded end 6 on which a: casing 'T passage d0, the titting` il extended into the S0 25 is screwed. The casing 5 is provided with casing r[,'and hose 4a to the nozzle 5l which interior screw threads at oneyend thereof is adapted to be attached to a tire air valve into which a. plug 8 is screwed. A i'od 9 or other suitable receiver. A passage 43 also entends through the plug 8 and is provided connects with the fitting all and the. passage with a piston l() on its enclosed end. A fl-O and extends to the chamber 4:4 within the 85 "G coiled spring` l1 is positioned around the casing 5 so as to assert torce upon the rod 9 between the inside face of the plug piston l0. As the pressure in the tire or 8 and one end ot the piston 10.v An arm 19. other receptacle builds up, pressure likewise is positioned on the casing 5 by means otv builds up in the chamber'td and tends to screws 13 and a lever 14- having an end l5 move the piston l() against the pressure of 90 35 bearing against the' end 16 ot' the rod 9, is the spring` l1. This movement. carries the pivcted to the arm as'at 17. tubular member 29 and as the tubular niem- A plug i8 is screwed into the `other end bei 29 moves7 the end 24 of the plunger 25 of the casing 7 andis provided with a reis moved upwardly by the action ot` the dicess lt) within which a coiled spring is agonal side 33 ot the groove or slot in the 95 ee seated. The spring` 2O extends from the retubular member 29. rThis action continues cess 19 and bears against the head Q1 on until the plunger 25 has been raised to a the rod 22.L rilhe rod 22 is provided with a point where the end 24 clears the slot 23 in notch 23 in which the end Qdi ot an apertured the rod 22 atI which time pressure in the plunger 25 seats. chamber 33 will snap the head 21 to seat 100 4G A fitting 2G is screwed into the casing y5 against the shoulder i5 on the casing 7 and directly over the notch Q3 and a nutI 2T is close the passage 40 with respect to the screwed on the fitting outside the casing` chamber 38. The spring 20 is provided to 5. rllhe fitting 26 is apertured to receive the assist insnapping the head 2.1 to its seat. plunger 25 and a coiled spring 28 is provided This `spring is not necessary in many con- 105 within theplunger 25 bearing at one end structions but may be round desirable Jfor against the bottom ot' the aperture in the certain purposes. flhe springs 28 and il are,

plunger and at the other end against the top ot course, proportioned to exert predeteroit the fitting 26. mined pressure and require a predetermined A. tubular member 29 is screwed on to the pressure of air or. other like substance to Uu P15 piston l0 as at 30 and a pin 31 is provided move them. A vent-'46 is provided in the for locking the same in place. rilie tubular casing 5 to prevent imprisoning air in the space Ll'r' between the plug 8 and the piston l0 and a similar vent 4S is provided in the plunger 25 so as to equalize pressures within the plunger with those at its lower end.

After the piston l() has been moved to a position where the head 2l is permitted to come to its seat and prevent the 'further passage ot' air through the hose 42, the hose Ll-2 is moved and connected to another tire or other similar object so as to repeat the process. At the same sime the lever ll is moved on its pivot to return the rod 5) and piston lt) back to the position shown in Fig. l, which movement pushes the rod 22 and its head 2l by reason ot' engagement ot the rod 22 in the end ot' the tubular member 20 as at so as to reopen the passage trom the chamber 38 to the space 39 and passage 40.

It will be appaient that l have provided an economical and well constructed device tor the purpose it is to serve and that the passage of air to the receptacle to be lilled is constant until air passage is sluit oil'. That is to say, it the pressure in the receptacle nears its shutting oli point the passage ot air leading to it is not diminished but is continued until such predetermined pressure is obtained when the air is consequently shut off by the snapping to ot the head 21.

It will be obvious various changes may be made in the arrangement, combination and construction ot' the various parts ot my improved device without departing from the spirit ot my invention, and it is my intention to cover by my claims such changes may be reasonably included within the scope thereof.

That I claim is l. In combination, a housing, an air inlet and an air outlet in said housing, a passage connecting the inlet and outlet, a valve seat in the passage, a valve adapted when seated to close the passage and when unseated to open it, a stem on said valve, a slot in the stem, ay sleeve enclosing` the stem, an opening` in said sleeve over said slot, a plunger extended into said opening and slot, one side ot' said opening being diagonally cut, and means for moving` said sleeve as pressure in the passage is built up. to raise said plunger along said diagonal side, and thereby clear the plunger ot the groove and permit movement of the valve and valve stem.

2. In combination, a housing having an air inlet and an air outlet therein, a passage connecting the openings, a resiliently held piston in the housing in communication with the passage and adapted to be moved by pressure built up therein, a sleeve connected to the piston, a valve stem in the sleeve, aligned slotsin the stem, and sleeve, one side ot' the latter being diagonally cut. a resiliently pressed plunger extended in the slots and adapted to travel along said diagonal side ol the sleeve slot when the sleeve and piston are moved, a valve seat in said passage and a valve mounted on the valve stem normally held in unseated position by the plunger in the stem slot. and adapted to snap to seated position to close the passage against t'urtlier entry ot air when said plunger has been moved by said sleeve to clear the stem slot.

3. A construction as set toith in claim et wherein a stem is attached to said piston, extending outside the housing, and a lever is positioned on the housing, adapted on actuation to return the piston at'ter the latter has been moved outwardly and permit re-entry ot' the plunger into the stem slot.

In combination, a tubular member havin; a. plug screwed in one end thereof, a coiled spring and a piston in the member. said spring being held between the inside oi the plug and one side ot' the piston, a member screwed on the other side of the piston and having a longitudinally extending aperture therein t'orming a sleeve. a valve stem extended into the sleeve, aligned slots in the stem and sleeve, one side of the latter being diagonally cut, a. second tubular member screwed on the tree end ot' the first tubular member and enclosing portions ol said sleeve and stem, a plunger housing screwed into said second tubular member, a plunger in said housing, a spring in the housing pressing one end of the plunger into said aligned grooves, a cap screwed on the free end ot said second tubular member and having a hollowed out portion therein, air inlet and air outlet portions in said second tubular member, a passage connecting the inlet and outlet extending through the hollowed out portion ot' the cap, a valve on said stem in said hollowed out portion, and a valve seat in the passage, whereby pressure built up in the passage will move said piston and its sleeve, to raise said plunger clear ot the stem slot and permit said valve to snap to its seat and thereby prevent 'further entry ot air to the air outlet.

JOHN D. PETERSEN. 

